This is not really born out by the facts. It's a problem baseball wide. As someone pointed out in another thread, the Sox are actually in the top third of teams in average starting pitcher innings (
we're tied for 7th with 4 other teams, at 5.3) We watch the Sox, so we assume it's a Sox-only issue, but in fact everybody's struggling to get their starters to go long into games.
If you want to argue the bullpen can't handle that load, then I don't know about that either. They're leading the league in blown saves right now, but there's two things there: one, they've lost highly winnable games they can win later and (2) that's largely been on the defense, as far as I can tell.
Team ERA is still 2.36. Last couple games are definitely an exception, to an extent: Campbell and Martin couldn't clean up, but Campbell also would've been out of the inning if Hamilton could've just put his stupid foot on the bag, for example.
Now, is the defense gonna be a permanent issue? That's a legitimate concern. I think we've seen way too many bad gaffes. Get Hamilton of SS pronto and that should solve a lot of our issues. The outfield I think will be okay. Rafaela, Duran, and Abreu have all made dumb mistakes, but I hope they're just getting their early-season yah-yahs out. Two of them are rookies, after all.
(We've also seen the Orioles make a couple of really dumb plays out in the field too -- we just didn't punish them for it.)